Fluid-proportioning apparatus



Mans, 1925. 1,538,643

I. LUNDGAARD FLUID PROPORTIONING APPARATUS Filed April 21, 1919 2 Sheets-Sheet 1 INVENTOR Ear 74s ATTORNEY-5 May 19, .1925. 1,538,643

I. LUNDGAARD FLUID PROPORTIONING APPARATUS Filed April 21, 1919 2 Sheets-Sheet 2 INVENTOR [d5 ATTORNEYS Patented May 19, 1925.

UNITED STATES PATENT. OFFICE.

IVAB LUNDGAA RD, OF ROCHESTER, NEW YORK, A SSIGNOR TO RATIOMETER COR- PORATION, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YOItK.

r'nurn-rnoron'rromivo' APPARATUS.

Application filed April 21, 1919. Serial No. 291,783.

To all whom it may concern:

Be it known that I, IVAR LUNDGAARD, a citizen of the United States, and a resident of the city of Rochester, county of Monroe, and State of New York, have invented certain new and useful Improvements in Fluid-Proportioning Apparatus; and I do declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying draw- ,ings, forminga part of this specification, and to the reference numerals marked thereon.

My invention relates to fluid proportioning apparatus and is in the nature of an imrovementon the apparatus disclosed in my atent No. 1,333,986, dated March 16, 1920. The object of my present invention is to provide improved means for supplying two or more fluids in certain constant and predetermined relative quantities in a given interval of time. More particularly, the obj ect of mi'y invention is to provide a simple apparatus susceptible of a wide range of application which is eflicient in operation, accurate, and 25 simple in construction. A still-further objeot of my invention is to provide. means for producing a proportional flow of fluids 'in two conductors in such a manner that the proportion. To these and other ends the in vention resides in certain improvements and 8 after more fully described, the novel features being pointed out in the claim at the end of the specification.

In the drawings: Figure 1 is a front elevation of a device illustrating one method of carrying out my invention;

Figure 2 is a side elevation of the same;

Figure 3 is a central vertical section through the housing for the fluid pressure chamber;

Figure 4 is a front elevation of. the same partly in section;

Figure 5 is a section taken on the line 5"5 of Figure 4;

Figure 6 is a section on line 6"6" of F igure- 3, and

Figures 7 and 8 are sections of details showing means for adjusting the flow of fluid through the main conductors.

combinations of parts, all as will be herein-.

Similar reference numerals throughout the several views indicate the same parts.

My invention is susceptible of a variety of applications as, for instance, to carbu-- retors for internal combustion engines or to air and gas mixers for gas furnaces and the like, where it is desirable to bring together two or more fluids in constant relative proportion irrespective of the variations in amount. 1

Referring more particularly to the drawings, I have shown my invention applied to a device for securing a constant proportional mixture of gas and air. I provide two main conductors, 1 for gas and 2 for air, which may lead to a single mixing chamber. Pressure reducing means are provided in each of these conductors at 3 and 4 which I have illustrated as being. in the nature of 'Venturi tubes, in which a throat of reduced cross sectional area is provided. A cone shaped adjustable member 10 is adapted to cooperate with the reduced area to increase or diminish the cross sectional area of the tube at the throat to adjust the rate of fiow as'related to the differential pressure. Each of the members 10, in the present instance, is mounted on a rod 11 bent over upon itself and slidable in a guideway provided therefor in the wall of the reduced portion of the tube. The rods 11 are provided with racks 9, adjacent their ends with which pinions 12 cooperate for adjusting the members 10 into or out of the throat provided in the tube. Each of the pinions 12 is mounted on a spindle 13 which may be provided with a finger piece 14 for actuating the same. Mounted between the conductors 1 and 2 is a housing 15 and a fluid chamber 16 and mounted in one of the fluid conductors, the air conductor 2 as illustrated in the drawings, is a butterfly valve 17 having an arm 18 on its spindle by which the butterfly valve is operated to open or close more or less completely the passage through the conductor 2. Mounted in the chamber 16- is a diaphragm 19 connected to one ofthe innerwalls of the chamher by means of a bellows 2010f leather or other suitable material. A rod 21 is secured to one of the faces of the diaphragm 19 and is slidably supported in the wall of the chamber 16, and is pivotally connected at its end with the arm 18 of the governing valve 17. Means are provided for actuating the diaphragm 19 by fluid pressure supplied by one of the main conductors, as for m stance, the air conductor 2 in a manner presently to be described.

The housing is divided into two com-- partments or chambers 27 and 28 by means of "a partition 23. which partition is divided the main conductors'l and 2. Since the fluid pressure at the constricted areas of the conductors is less than inthe unobstructed portions of said conductors, the conductors 29 and 30 carry fluids at a pressure somewhat below the normal pressure in the unobstructed main conductor ipes. In each of the chambers 27 and 28 1s mounted a fluid pres-' sure diaphragm 31 and 32 connected with opposite inner Walls of the chamber by means of the bellows 33 and 34. The diaphragms 31 and .32 are carried on frame members 37, 37 and 37 rigidly supported on the pivoted member 26 so that both of the diaphragms together with the frame move as a single unit. Communicating with the chambers 27 and 28 and opening into the bellows 32 and 33- are fluid conductors 35 and 36 leading to the main conductors 1 and 2 and to unrestricted portions thereof so that the normal unobstructed pressure in said conductors is communicated within the bellows 33 and 34 or to the opposite sides of the diaphragms 31 and 32 from that to which the fluid from the restricted areas is conducted." The member 37 of the swim 'ng frame by which the diaphragms 31 an 32 are supported is pivotally connected with a slide valve 38. The slide valve 38 operates in a valve casing 39 tapped into one of the walls of the housing 15. The valve casing 39 has a longitudinal opening 40 therethrough opened to the atmosphere at its outer end and a plurality of lateral openings 41, 42,43 and 44 leading therefrom. The opening 44'lead's directly to the atmosphere while the openings 41, 42, and 43 are tapped pipes 45, 46 and 47. leads to one of theto receive conductor The conductor pipe 4 main conductors and the conductors 45 and 46 lead to the fluid pressure chamber 16,. one opening within the bellows 20 and the other to theoutside of said bellows. By this construction it will be noted that the fluid pressure in thechamber 16 produced by fluid lead thereto by the conductors 45 and 46 will operate on opposite sides of the diaphragm 19. Movement of the diaphragm 19 due to variations in the fluid pressure on opposite sides thereof will cause a movement of the governing valve 17 to open or closethe same. The valve 38 is adapted to slide in the open 40 and has three enlarged portions 38' in adapted to seal the opening 40, and permitting the free passage of fluid between them.

or 46 with the fluid pressure in the main fluid conductor and to open the other conductor to the atmosphere through the valve casing. By reference to Figure 6, it will be noted that when the valve 38 is in the "position here illustrated, the liuid entering the valve casing from the main conductor 2 through the conductor 47 is directed into the conductor 46 and enters the chamber 16 within the bellows 20. At the same time the conductor 45 is in communication with the atmosphere through the openin 40 in the outer end of the valve 'caslng. y this arrangement a pressure differential is produced tending to move the diaphragm 19 to the right as viewed in Figure 1. A change in the relative pressures or difference in pressure in the main conductors 1 and 2 will cause some movement of the diaphragms 31' and 32 and the frame on which they are carried causing a corresponding movement of the valve 38. If the valve 38 is moved to the left as seen in. Figure 6 the connection through the valve casing from the conductor 47 to the conductor '46 is closed and communication established from said conductor to the atmosphere through the port 44. Simultaneously the opening 40 is closed and communication established between the conductor 47 andthe conductor 45, thus establishing direct communication between the main'conductor 2 and the chamber 16 said pressure being new applied to the right hand side of the diaphragm 19 tending to move said diaphragm in the opposite direction. The operation of my device is as follows: Fluid from the main conductor 2 taken from the constricted portion 4 is conducted to the chamber 28 through the pipe 30 and from an unobstructed portion of said conductor through the conductor 36 to the opposite side of the diaphragm 32 in the chamber 28. Similarly fluid is conducted to opposite sides of the diaphragm 31 from the main conductor 1. The fluid-pressure differential in the two conductors 1 and 2 acts in opposition to move the diaphragms 31 and 32 and the frame connected therewith to actuate the slide valve 38. Actuation of the valve 38 serves to connect one side of the diaphragm 19'with the fluid pressure from the conductor 2 and the other side with the atmosphere through one of the openings 40 or 44 in the or less completely close the passagethrough the conductor 2. When'the pressure difi'erentials of the two conductors are in a state of equilibrium, no'motion of the valve actuating mechanism or of its controlling device results and the desired proportional flow exists. Such motion is set up by the automatic instrumentalities described in the effort to restore-that equilibrium as soon as In a fluid proportionin apparatus, the

combination with two con uctors each pro vided with means for creating difi'erential pi'essure therein and means for regulating the rate of flow through one of the conductors, of a pressure operated device for actufor said device-embodying a casing having two pressure chambers, a rock shaft extending 'mto both chambers, pneumatic devices in the respective chambers connected to the shaft to operate it in opposite directions, said devices being respectively sensitive to the pressure differentials in the respective conductors, and means actuated by the'rock shaft for controlling pressure to the actuating devices, said means being located exteriorly of both pressure chambers.

IVAR LUNDGAARD.

.ating said means and a controlling means 

